1 # Subroutine makefile for compiling libc modules linked into dynamic linker.
3 # Copyright (C) 2002, 2003, 2005, 2006, 2008 Free Software Foundation, Inc.
4 # This file is part of the GNU C Library.
6 # The GNU C Library is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU Lesser General Public
8 # License as published by the Free Software Foundation; either
9 # version 2.1 of the License, or (at your option) any later version.
11 # The GNU C Library is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # Lesser General Public License for more details.
16 # You should have received a copy of the GNU Lesser General Public
17 # License along with the GNU C Library; if not, write to the Free
18 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 # This makefile is never used by itself, but only from the rtld-libc.a
22 # rule in Makefile, which does make -f librtld.mk -f rtld-Rules.
23 # librtld.mk is the generated file containing variable definitions for
24 # `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each
25 # SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names.
30 # When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
33 error rtld-modules not set
38 # Running to build rtld-libc.a, driving runs of $(rtld-subdir-make), below.
41 error This makefile is a subroutine of elf/Makefile not to be used directly
46 rtld-all: $(objpfx)rtld-libc.a
48 $(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
49 $(addprefix $(common-objpfx)$(dir)/rtld-,\
52 $(AR) cq$(verbose) $@T $^
56 # Use the verbose option of ar and tar when not running silently.
57 ifeq "$(findstring s,$(MAKEFLAGS))" "" # if not -s
64 # For each subdirectory, define a pattern rule that makes all of that
65 # subdirectory's modules at once with one recursive make command.
66 object-suffixes-left := $(rtld-subdirs)
67 define o-iterator-doit
68 $(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \
71 include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
73 # This is how we descend into each subdirectory. See below.
74 define rtld-subdir-make
75 $(MAKE) $(subdir-args) objdir=$(objdir) \
76 -f Makefile -f ../elf/rtld-Rules rtld-all \
77 rtld-modules='$(addprefix rtld-,$(rtld-$*))'
80 # See subdir-target-args in ../Makefile for the model.
81 subdir-args = subdir=$*$(if $($*-srcdir),\
82 -C $($*-srcdir) ..=`pwd`/,\
89 # In this case we are being run by $(rtld-subdir-make), above.
90 # Some other subdir's Makefile has provided all its normal rules,
91 # and we just provide some additional definitions.
93 # These are the basic compilation rules corresponding to the Makerules ones.
94 # The sysd-rules generated makefile already defines pattern rules for rtld-%
95 # targets built from sysdeps source files.
96 $(objpfx)rtld-%.os: rtld-%.S $(before-compile)
97 $(compile-command.S) $(rtld-CPPFLAGS)
98 $(objpfx)rtld-%.os: rtld-%.s $(before-compile)
99 $(compile-command.s) $(rtld-CPPFLAGS)
100 $(objpfx)rtld-%.os: rtld-%.c $(before-compile)
101 $(compile-command.c) $(rtld-CPPFLAGS)
102 $(objpfx)rtld-%.os: %.S $(before-compile)
103 $(compile-command.S) $(rtld-CPPFLAGS)
104 $(objpfx)rtld-%.os: %.s $(before-compile)
105 $(compile-command.s) $(rtld-CPPFLAGS)
106 $(objpfx)rtld-%.os: %.c $(before-compile)
107 $(compile-command.c) $(rtld-CPPFLAGS)
109 # The rules for generated source files.
110 $(objpfx)rtld-%.os: $(objpfx)rtld-%.S $(before-compile); $(compile-command.S)
111 $(objpfx)rtld-%.os: $(objpfx)rtld-%.s $(before-compile); $(compile-command.s)
112 $(objpfx)rtld-%.os: $(objpfx)rtld-%.c $(before-compile); $(compile-command.c)
113 $(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile); $(compile-command.S)
114 $(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile); $(compile-command.s)
115 $(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile); $(compile-command.c)
117 # The command line setting of rtld-modules (see above) tells us
118 # what we need to build, and that tells us what dependency files we need.
119 rtld-all: $(addprefix $(objpfx),$(rtld-modules))
121 # Figure out the dependency files we need. After respecting the $(omit-deps)
122 # list as applied to the names without the `rtld-', there may be none left.
123 rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.os.d,\
124 $(filter-out $(omit-deps),\
125 $(rtld-modules:rtld-%.os=%)))
126 rtld-depfiles := $(strip $(wildcard $(rtld-depfiles)) \
127 $(patsubst %.dt,%.d,\
128 $(wildcard $(rtld-depfiles:.d=.dt))))
130 -include $(rtld-depfiles)
133 # This here is the whole point of all the shenanigans.
134 rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1